CN112609120B - Preparation method of high-nitrogen stainless steel and casting ladle pouring device adopted by same - Google Patents
Preparation method of high-nitrogen stainless steel and casting ladle pouring device adopted by same Download PDFInfo
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- CN112609120B CN112609120B CN202011370569.9A CN202011370569A CN112609120B CN 112609120 B CN112609120 B CN 112609120B CN 202011370569 A CN202011370569 A CN 202011370569A CN 112609120 B CN112609120 B CN 112609120B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/04—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like tiltable
- B22D41/05—Tea-pot spout ladles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/06—Equipment for tilting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/12—Travelling ladles or similar containers; Cars for ladles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/005—Manufacture of stainless steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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Abstract
The invention discloses a preparation method of high-nitrogen stainless steel and a casting ladle pouring device adopted by the same, belonging to the technical field of preparation of high-nitrogen martensitic stainless steel, wherein the preparation method comprises the steps of firstly smelting a high-nitrogen alloy melt, then adding a base steel material and other elements into the high-nitrogen alloy melt, adding a carbon element in the smelting process, and discharging and pouring after complete melting and uniform stirring; the driving mechanism in the casting device of the casting ladle comprises an arc inner track, an arc main track and an arc outer track which all use the tip of a casting ladle opening as the center of a circle. According to the preparation method provided by the invention, the high-nitrogen alloy and the base steel material are stably fused to obtain the high-nitrogen billet with less bubbles and high nitrogen content, and the finally prepared product has the characteristics of high hardness, high-temperature oxidation resistance, low-temperature resistance and wear resistance; the ladle pouring device can keep the pouring position of the ladle unchanged, reduces the metal liquid splashing waste caused by the change of the pouring gate position in the pouring process, and can improve the quality of the melt for realizing pouring.
Description
Technical Field
The invention relates to the technical field of preparation of high-nitrogen martensitic stainless steel, in particular to a preparation method of high-nitrogen martensitic stainless steel and a casting ladle pouring device adopted by the preparation method.
Background
High nitrogen martensitic stainless steel attracts attention for its excellent properties such as corrosion resistance, high strength, and high plasticity, and is widely used as a novel steel grade having high toughness and corrosion resistance and rust resistance in a wider and more complicated field. The martensitic stainless steel has better mechanical property than austenitic stainless steel, has good impact resistance, wear resistance and high temperature resistance, has high hot hardness, can replace partial tungsten and cobalt alloy, does not deform at 950 ℃, and has good mechanical sealing property in severe environment. However, at present, in the preparation process of the existing high-nitrogen martensitic stainless steel, the fusion of a high-nitrogen alloy and a base steel material is not stable enough, and more nitrogen escapes, so that a nitrogen steel melt contains less nitrogen and has insufficient stability, and the quality level of a produced high-nitrogen steel blank is lower.
In the production process of stainless steel, an alloy melt is generally smelted, and then the alloy melt is cast to finally obtain the stainless steel. The pouring operation usually needs a pouring ladle pouring device, the pouring ladle is used for pouring operation in a casting workshop, and after receiving molten metal in front of a furnace, the molten metal is transported to a casting mould by a travelling crane for pouring, and the pouring ladle is divided into various styles such as a ladle, a teapot ladle, a ductile iron ladle and the like. In the pouring process, the inclination angle of the pouring ladle needs to be changed, so that the molten metal in the pouring ladle is poured into the mold, however, when a common pouring ladle is poured, a pouring ladle opening rotates by taking the rotating shaft as a circle center, the molten metal is difficult to align to a smaller pouring ladle cup, alloy liquid is splashed and wasted, and certain danger and cost are increased in production.
Disclosure of Invention
1. Technical problem to be solved
The technical problem to be solved by the invention is to provide a preparation method of high-nitrogen stainless steel and a ladle pouring device adopted by the preparation method, wherein the provided preparation method can promote the stable fusion of high-nitrogen alloy and base steel material so as to obtain a high-nitrogen steel blank with less bubbles and high nitrogen content, and the high-nitrogen martensitic stainless steel can be produced due to the introduction of carbon element, so that the finally prepared product has the characteristics of high hardness, high-temperature oxidation resistance, low temperature resistance and wear resistance; the pouring device of the pouring ladle provided by the invention can keep the pouring position of the pouring ladle unchanged, reduce the metal liquid splashing waste caused by the change of the pouring gate position in the pouring process, and improve the quality of the melt for realizing pouring.
2. Technical scheme
In order to solve the problems, the invention adopts the following technical scheme:
a preparation method of high-nitrogen stainless steel comprises the steps of firstly smelting a high-nitrogen alloy melt, then adding a base steel material into the high-nitrogen alloy melt, adding a carbon element in the smelting process, controlling the carbon content to be 0.1-1 wt%, and controlling the nitrogen content to be 0.1-1 wt%; and after the materials are completely melted and uniformly stirred, discharging the materials out of the furnace and pouring the materials to obtain the high-nitrogen steel. The method comprises the following specific steps:
s1, preparing a material for preparing the high-nitrogen alloy melt and a base steel material, wherein the material for preparing the high-nitrogen alloy melt comprises high-nitrogen ferrochrome, ferrochrome nitride and manganese nitride; the basic steel material comprises solid manganese metal, solid iron metal, molybdenum, niobium, copper, titanium, vanadium, rare earth and the like;
s2, smelting a high-nitrogen alloy melt, wherein the mixing ratio of the high-nitrogen ferrochrome to the nitrided ferrochrome is arbitrary, and the manganese nitride is added according to the components; adding the mixture of high-nitrogen ferrochrome, chromium nitride and manganese nitride into a furnace, heating until the mixture is completely melted, keeping the melt at a lower temperature capable of maintaining the melt state, namely, keeping the melt at 1450-1600 ℃, and controlling the nitrogen content to be 2-10 wt%;
s3, adding ferromanganese or/and solid manganese metal and at least one of ferrochrome and ferrovanadium into the high-nitrogen alloy melt obtained in the step S2 to obtain a high-manganese high-nitrogen alloy melt; the addition amount of the metal manganese is 5-30 wt% of the weight of the high-nitrogen steel calculated according to the design components of the high-nitrogen steel, the melt temperature is the lower temperature for maintaining the melt state, and the temperature range is 1450-1600 ℃;
s4, adding solid metallic iron and other elements into the high-manganese high-nitrogen alloy melt obtained in the step S3 to obtain a high-nitrogen steel melt; the addition amount of the metallic iron is 30-60 wt% of the weight of the high-nitrogen steel calculated according to the design components of the high-nitrogen steel; the other elements comprise molybdenum, niobium, copper, titanium, vanadium, rare earth and the like, and the addition amount of the other elements is 0-8 wt% of the weight of the high-nitrogen steel calculated according to the design components of the high-nitrogen steel; the temperature of the melt is lower than that of the melt, and the temperature range is 1450-1600 ℃;
and S5, after the solid matters in the high-nitrogen steel melt obtained in the step S4 are completely melted, continuously and uniformly stirring for 0-15 min, then quickly controlling the temperature to 1550-1650 ℃, and carrying out sampling, tapping and pouring after deoxidation and slag discharge to finally obtain the high-nitrogen steel.
Further, in step S4, the solid metallic iron is industrially pure iron, and is in the shape of granules or strips, and the granular size thereof is phi 1 to phi 30 mm; the size of the strip-shaped section is phi 1-phi 30 mm.
Further, in step S4, the solid metallic iron is added continuously at a rate of 1000kg/min or less.
Further, in step S4, the addition amounts of the other elements are: less than or equal to 5.0 wt% of molybdenum, less than or equal to 0.5 wt% of niobium, less than or equal to 2.0 wt% of copper, less than or equal to 0.5 wt% of titanium, less than or equal to 0.5 wt% of vanadium, and less than or equal to 0.5 wt% of rare earth and rare earth metals.
The S, P, O, slagging and deslagging method in the smelting process is a conventional steelmaking operation method.
The invention also provides a ladle pouring device adopted in the preparation method, which comprises a ladle body, a travelling crane for conveying the ladle body, a support arranged in a pouring area and a driving mechanism connected to the support and used for driving the ladle body to pour, wherein one side of an upper port of the ladle body is provided with a ladle port, the support is a top plate which is elevated and horizontally arranged, two opposite sides of the support are both connected with a side vertical plate which is vertically arranged, a space for placing the ladle body is reserved between the two side vertical plates, and the two side vertical plates are respectively provided with a group of driving mechanisms;
the driving mechanism comprises an arc-shaped inner rail, an arc-shaped main rail and an arc-shaped outer rail which are concentrically arranged on the side vertical plate, the arc-shaped inner rail, the arc-shaped main rail and the arc-shaped outer rail all use the tip end of the ladle opening as the circle center, the arc-shaped main rail is positioned in the middle between the arc-shaped inner rail and the arc-shaped outer rail, and the bending directions of the arc-shaped inner rail, the arc-shaped main rail and the arc-shaped outer rail are the same; the inner side of the arc-shaped inner track and the outer side of the arc-shaped outer track are respectively connected with a sliding block in a sliding manner, a connecting insert block used for connecting a ladle body is arranged in the sliding block in a penetrating manner, two connecting blocks which are respectively aligned with the bottoms of the arc-shaped inner track and the arc-shaped outer track are fixed on the corresponding side of the ladle body, a connecting slot for inserting the connecting insert block is formed in one side of each connecting block, which faces away from the ladle body, and a driving connecting rod positioned on the outer side of the side vertical plate is connected between one sides of the two connecting insert blocks, which face away from the ladle body; the traction rope extending along the radian of the arc main track is arranged in the arc main track in a penetrating mode, the lower end of the traction rope is connected with an inner sliding block in sliding connection with the arc main track, the middle of the driving connecting rod is fixedly connected with the inner sliding block through a connecting plate, a winding shaft which is connected with the upper end of the traction rope and used for winding the traction rope is arranged above the upper end of the arc main track, one end of the winding shaft is connected with a driving motor, and the two ends of the winding shaft are connected with the side vertical plates through bearings respectively.
Furthermore, the cross section of the connecting slot is circular, at least two rectangular groove parts extending outwards are arranged on the peripheral side of the connecting slot at equal intervals, and the connecting plug block is matched with the connecting slot in shape. The arrangement of the rectangular groove part can stably realize the insertion relation between the connecting slot and the connecting plug block and prevent relative rotation between the connecting slot and the connecting plug block.
Furthermore, be equipped with the carrier board that is used for placing the ladle inclusion on the driving, and be equipped with on the carrier board and be used for carrying out spacing fixture block to the ladle inclusion, the bottom of carrier board is connected on the driving bottom plate through the electric telescopic handle who vertically sets up, the universal wheel is installed to the bottom of driving bottom plate. The arrangement of the carrier plate with the clamping blocks can ensure that the ladle body is stably conveyed, and after the ladle body is connected to the driving mechanism, the carrier plate can be driven to descend by driving the electric telescopic rod, so that the travelling crane can be conveniently removed, and the ladle body can be rotated in enough space below the ladle body.
Further, the cross-section of slider is the I shape, and its middle part is located corresponding arc inner rail or arc outer rail, the inside inner arc side of arc main rail is equipped with the gyro wheel along its radian direction is equidistant, the corresponding side and the attached formula contact of gyro wheel of interior slider. The I-shaped sliding block can prevent the sliding block from separating from the arc inner track or the arc outer track; the arrangement of the roller can promote the sliding relation between the sliding block and the arc-shaped main track, so that the movement of the inner sliding block can be ensured.
Further, the inside rotation baffle that is located the side of watering ladle mouth place and is equipped with a vertical setting of watering ladle inclusion, the side all is attached completely with the corresponding side lateral wall of watering ladle inclusion around the rotation baffle, the pivot on fixed connection to the watering ladle inclusion inner wall is transversely worn to be equipped with in the middle part of rotation baffle, and rotates the baffle and can revolute the axle free rotation, the upper end of watering ladle inclusion is fixed with the stopper that is used for injecing rotation baffle turned angle, the lower part of watering ladle inclusion is equipped with one and is located the push roll of rotation baffle lower extreme dorsad watering ladle mouth one side, the push roll is on a parallel with the pivot, and sets up the cell type guide rail that supplies the tip of push roll to insert and lateral shifting on the inner wall of watering ladle inclusion place that the both ends of push roll correspond. In an initial state, the upper part of the rotating baffle is attached to the pouring gate, the lower end of the rotating baffle is positioned on one side of the rotating shaft back to the pouring gate, and the push roller is positioned on one side of the groove-shaped guide rail back to the pouring gate; when the rotatory ladle inclusion that begins topples over, the push roll can be followed the cell type guide rail and removed to ladle mouth place side, thereby can promote the lower extreme that rotates the baffle and remove to ladle mouth place side, make the upper end that rotates the baffle leave the ladle mouth, to touching the stopper, then when toppling over, the fuse-element can follow rotation baffle lower extreme side and pass through between the inner wall of rotation baffle and ladle mouth place side, finally pour out between rotation baffle upper end and the ladle mouth, and the dross that floats on the fuse-element surface can be blocked and can't discharge by rotating the baffle, thereby can promote the quality of the fuse-element of carrying out the pouring.
3. Advantageous effects
(1) The preparation method provided by the invention comprises the steps of firstly smelting alloy melts such as ferrochromium nitride, manganese nitride, ferromanganese, ferrovanadium and the like (added according to finished product components), then adding a base steel material into the alloy melts, and taking out of a furnace for pouring after the base steel material is completely molten and uniformly stirred. The method is favorable for promoting the stable fusion of the high-nitrogen alloy and the base steel material, remarkably reducing the escape of nitrogen, and obtaining a stable high-nitrogen steel melt with higher nitrogen content, thereby obtaining a high-nitrogen steel billet with less bubbles and high nitrogen content, and the nitrogen content can reach 0.9 percent at most through detection.
(2) Compared with high-nitrogen austenitic stainless steel, the method has the characteristics that more than 0.1 wt% of carbon element is added into molten steel, the carbon content is adjusted according to the characteristics of products, the high-nitrogen martensitic stainless steel is produced, the highest nitrogen content can reach 1.0 wt% by detection, and the products have the characteristics of high hardness, high-temperature oxidation resistance, low-temperature resistance and wear resistance according to different product components.
(3) The driving mechanism for driving the ladle body to pour in the ladle pouring device provided by the invention comprises an arc-shaped inner track, an arc-shaped main track and an arc-shaped outer track, wherein the arc-shaped inner track, the arc-shaped main track and the arc-shaped outer track all use the tip of a ladle opening as a circle center; the arc main track is internally provided with a traction rope extending along the radian of the arc main track in a penetrating manner, the lower end of the traction rope is connected with an inner slide block which is connected with the arc main track in a sliding manner, the driving connecting rod is fixedly connected with the inner slide block, and the upper end of the traction rope is connected with a winding shaft driven by a driving motor. When the automatic casting device is applied, the driving motor is started, the winding shaft is driven to wind the traction rope, the inner sliding block can be pulled to move upwards along the arc-shaped main rail, the driving connecting rod is driven to move upwards, the two sliding blocks respectively move upwards along the arc-shaped inner rail and the arc-shaped outer rail, the casting ladle body is driven to rotate, the arc-shaped inner rail, the arc-shaped main rail and the arc-shaped outer rail both use the tip of the casting ladle port as the center of a circle, the casting ladle body rotates upwards around the tip of the casting ladle port, the casting position is kept unchanged in the casting process, the metal liquid splashing waste caused by the change of the pouring gate position in the casting process is reduced, the casting production safety is improved, the utilization rate of alloy materials is improved, the energy is saved, and the personal safety of workers is improved.
(4) The invention provides a pouring ladle pouring device, wherein a rotating baffle is arranged at the side of a pouring ladle body, which is positioned at a pouring ladle opening, and can freely rotate around a rotating shaft at the middle part of the rotating baffle, a limiting block for limiting the rotating angle of the rotating baffle is fixed at the upper end part of the pouring ladle body, a push roller for pushing the lower end of the rotating baffle is arranged at the lower part of the pouring ladle body, and a groove-shaped guide rail for inserting the end part of the push roller and transversely moving is arranged on the inner wall of the side, corresponding to the two ends of the push roller, of the pouring ladle body. In the pouring process, because the rotation of the ladle inclusion, the push roller can move to the side of pouring ladle mouth place along the cell type guide rail, thereby can promote the lower extreme of rotating the baffle and move to the side of pouring ladle mouth place, make the upper end of rotating the baffle leave the pouring ladle mouth, to touching the stopper, then when empting, the fuse-element can follow the lower extreme side of rotating the baffle and between the inner wall of rotating baffle and pouring ladle mouth place side, finally pour out from rotating between baffle upper end and the pouring ladle mouth, and the dross that floats on the fuse-element surface can be blocked and can't be discharged by rotating the baffle, thereby can promote the quality of the fuse-element that realizes the pouring.
In conclusion, the preparation method provided by the invention can promote the stable fusion of the high-nitrogen alloy and the base steel material so as to obtain a high-nitrogen steel blank with less bubbles and high nitrogen content, and the high-nitrogen martensitic stainless steel can be produced due to the introduction of the carbon element, so that the finally prepared product has the characteristics of high hardness, high-temperature oxidation resistance, low temperature resistance and wear resistance; the pouring device of the pouring ladle provided by the invention can keep the pouring position of the pouring ladle unchanged, reduce the metal liquid splashing waste caused by the change of the pouring gate position in the pouring process, and improve the quality of the melt for realizing pouring.
Drawings
FIG. 1 is a front view of the present invention in a schematic configuration;
FIG. 2 is a front view of the structure of the travelling crane 16 in the condition of conveying the ladle body 4;
FIG. 3 is an enlarged view of the structure of the area A in FIG. 1;
FIG. 4 is a cross-sectional view of the slider 15 and the connecting insert 18;
FIG. 5 is a schematic view of the internal structure of the ladle body 4, with the ladle body 4 now in a flat position;
FIG. 6 is a schematic view of the internal structure of the ladle body 4, with the ladle body 4 in rotation, with the arrows indicating the flow of the melt.
Reference numerals: 1. an electric telescopic rod; 2. a carrier plate; 3. a driving connecting rod; 4. a ladle body; 5. pouring a ladle opening; 6. an arc-shaped main track; 7. an arc-shaped inner track; 8. a spool; 9. a support; 10. a drive motor; 11. a bearing; 12. a side vertical plate; 13. an arc-shaped outer track; 14. a pulling rope; 15. a slider; 16. driving a vehicle; 17. a universal wheel; 18. connecting the plug blocks; 19. connecting the slots; 20. connecting blocks; 21. a connecting plate; 22. a roller; 23. an inner slide block; 24. a groove-shaped guide rail; 25. rotating the baffle; 26. a limiting block; 27. a rotating shaft; 28. and (7) pushing the roller.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The melting furnace for the test adopts a 100kg medium frequency induction furnace; the weight of the high-nitrogen steel prepared in each test is about 90 kg;
the materials used for the test are industrial pure iron (C is less than or equal to 0.05 wt%, the strip size is 50 multiplied by 20 multiplied by 400mm), high-nitrogen ferrochrome (N is 8 wt%, Cr is 50 wt%), ferromolybdenum (Mo is 61%), ferromanganese (Mn is 66 wt%), ferrochrome (Cr is 57.5%);
the main design components of the test are as follows: 0.3 to 0.4 wt% of C, 15 to 16 wt% of Cr, 0.9 to 1.1 wt% of Mn, 0.3 to 0.5 wt% of N, 2 to 2.2 wt% of Mo, not more than 1 wt% of other elements such as Si, S and P, and the balance Fe.
Example 1
The preparation method of the high-nitrogen martensitic stainless steel by using the ferrochrome nitride as the main nitrogen-added alloy comprises the following steps:
s1, the total weight of the prepared materials is 91kg, wherein the main materials of the base steel are as follows: 58.3kg of industrial pure iron, 3.2kg of ferromolybdenum, 1.2kg of ferromanganese and 11.6kg of ferrochromium; the preparation of the high-nitrogen alloy melt material comprises the following steps: 15.5kg of ferrochromium nitride; 0.1-0.2 kg of other elements such as rare earth and the like;
s2, preparing a high-nitrogen alloy melt by using a medium-frequency induction furnace, adding all the ferrochrome nitride into the furnace, heating until all the ferrochrome nitride is melted, and adjusting the temperature of the melt to be 1600-1650 ℃;
s3, adding ferromanganese into the furnace until the ferromanganese is completely melted, and adjusting the temperature of the melt to be between 1500 and 1600 ℃ to obtain a high-manganese high-nitrogen alloy melt;
s4, adding ferromolybdenum, rare earth and other elements into the furnace until the elements are completely melted, and adjusting the temperature of the melt to be between 1500 and 1600 ℃;
and S5, after the addition is finished, keeping the melt temperature at 1500-1560 ℃, simultaneously uniformly stirring for 3min by using the medium-frequency electromagnetic action, raising the melt temperature to 1650 ℃, and carrying out sampling, tapping and casting after deoxidation and slag discharge to finally prepare the high-nitrogen steel.
The weight of the obtained high-nitrogen steel is weighed to be 90kg, and the main chemical components are detected as follows: 0.37 wt% of C, 15.94 wt% of Cr, 0.85 wt% of Mn, 0.43 wt% of N, 2.14 wt% of Mo, 0.38 wt% of Si, 78.95 wt% of Fe, and the balance of other elements.
Example 2
The preparation method of the high-nitrogen steel by using the nitriding ferrochrome and the ferrochrome as main nitrogen-added alloys comprises the following steps:
s1, the total weight of the prepared materials is 91kg, wherein the main materials of the base steel are as follows: 63kg of industrial pure iron, 1.55kg of ferromolybdenum, 1.2kg of ferromanganese and 8.2kg of ferrochromium; the preparation of the high-nitrogen alloy melt material comprises the following steps: 18.2kg of ferrochromium nitride; the other 0.1 kg;
s2, preparing a high-nitrogen alloy melt by using a medium-frequency induction furnace, adding high-nitrogen ferrochrome and ferrochrome into the furnace, heating until the high-nitrogen ferrochrome and the ferrochrome are completely melted, and adjusting the temperature of the melt to be 1600-1650 ℃;
s3, adding ferromolybdenum and other materials into the furnace until the materials are completely melted, and adjusting the temperature of the melt to be between 1500 and 1550 ℃ to obtain a high-manganese high-nitrogen alloy melt;
s4, gradually adding industrial pure iron into the furnace at the adding speed of 800kg/min and controlling the melt temperature between 1500 ℃ and 1550 ℃;
and S5, after the addition is finished, keeping the melt temperature at 1500-1530 ℃, simultaneously uniformly stirring for 10min by using the medium-frequency electromagnetic action, raising the melt temperature to 1650 ℃, and performing sampling, tapping and pouring after deoxidation and slag tapping to finally prepare the high-nitrogen steel.
The weight of the obtained high-nitrogen steel is 89.5kg, and the main chemical components are detected as follows: 0.15 wt% of C, 15.2 wt% of Cr, 1.04 wt% of Mo, 0.39 wt% of N, 83.23 wt% of Fe and the balance of other elements.
Example 3
The preparation method of the high-nitrogen steel by using the nitriding ferrochrome and the ferrochrome as main nitrogen-added alloys comprises the following steps:
s1, the total weight of the prepared materials is 91kg, wherein the main materials of the base steel are as follows: 63.4kg of industrial pure iron, 1.55kg of ferromolybdenum and 9.45kg of ferrochromium; the preparation of the high-nitrogen alloy melt material comprises the following steps: 16.4kg of ferrochromium nitride; the other 0.05 kg;
s2, preparing a high-nitrogen alloy melt by using a medium-frequency induction furnace, adding all of ferrochrome nitride and ferrochrome into the furnace, heating until all of the ferrochrome nitride and the ferrochrome are molten, and adjusting the temperature of the melt to be 1600-1650 ℃;
s3, adding ferromolybdenum and other materials into the furnace until the materials are completely melted, and adjusting the temperature of the melt to be between 1500 and 1550 ℃ to obtain a high-manganese high-nitrogen alloy melt;
s4, gradually adding industrial pure iron into the furnace at a speed of 500kg/min, and controlling the melt temperature between 1500 ℃ and 1530 ℃;
and S5, after the addition is finished, keeping the melt temperature at 1500-1530 ℃, simultaneously uniformly stirring for 10min by using the medium-frequency electromagnetic action, raising the melt temperature to 1650 ℃, and performing sampling, tapping and pouring after deoxidation and slag tapping to finally prepare the high-nitrogen steel.
The weight of the obtained high-nitrogen steel is 89.2kg, and the main chemical components are detected as follows: 0.293 wt% of C, 15.01 wt% of Cr, 1.03 wt% of Mo, 0.33 wt% of N, 82.95 wt% of Fe and the balance of other elements.
Example 4
The preparation method of the high-nitrogen steel by using the nitriding ferrochrome and the ferrochrome as main nitrogen-added alloys comprises the following steps:
s1, the total weight of the prepared materials is 91kg, wherein the main materials of the base steel are as follows: 62kg of industrial pure iron, 2.23kg of ferromolybdenum, 0.8kg of ferrovanadium and 9.45kg of ferrochromium; the preparation of the high-nitrogen alloy melt material comprises the following steps: 16.36kg of ferrochromium nitride; the other 0.05 kg;
s2, preparing a high-nitrogen alloy melt by using a medium-frequency induction furnace, adding high-nitrogen ferrochrome and ferrochrome into the furnace, heating until the high-nitrogen ferrochrome and the ferrochrome are completely melted, and adjusting the temperature of the melt to be 1600-1650 ℃;
s3, adding ferromolybdenum, ferrovanadium and other materials into the furnace until the materials are completely melted, and adjusting the temperature of the melt to be between 1500 and 1550 ℃ to obtain a high-manganese high-nitrogen alloy melt;
s4, gradually adding industrial pure iron into the furnace at the adding speed of 800kg/min and controlling the melt temperature between 1500 ℃ and 1550 ℃;
and S5, after the addition is finished, keeping the melt temperature at 1500-1530 ℃, simultaneously uniformly stirring for 10min by using the medium-frequency electromagnetic action, raising the melt temperature to 1650 ℃, and performing sampling, tapping and pouring after deoxidation and slag tapping to finally prepare the high-nitrogen steel.
The weight of the obtained high-nitrogen steel is weighed to be 88.7kg, and the main chemical components are detected as follows: 0.2 wt% of C, 15 wt% of Cr, 1.5 wt% of Mo, 0.35 wt% of V, 0.35 wt% of N, 82.03 wt% of Fe, and the balance of other elements.
Example 5
The preparation method of the anti-deformation, high-temperature oxidation resistance and wear resistance high-nitrogen steel by taking the ferrochrome nitride and the ferrochrome as main nitrogen-added alloys comprises the following steps:
s1, the total weight of the prepared materials is 91kg, wherein the main materials of the base steel are as follows: 17.73kg of industrial pure iron, 0.91kg of ferromolybdenum, 0.82kg of ferrovanadium, 18.kg of ferrochromium, 54kg of manganese nitride, 22.73kg of nickel and 0.88kg of ferrosilicon; the preparation of the high-nitrogen alloy melt material comprises the following steps: 16.36kg of ferrochromium nitride and 1.82kg of manganese nitride; 0.136kg of niobium and 0.073kg of the rest;
s2, preparing a high-nitrogen alloy melt by using a medium-frequency induction furnace, adding high-nitrogen ferrochrome and manganese nitride into the furnace, heating until the high-nitrogen ferrochrome and the manganese nitride are completely molten, and adjusting the temperature of the melt to be 1600-1650 ℃;
s3, adding ferromolybdenum, ferrovanadium, ferrochromium, nickel and other materials into the furnace until the materials are completely melted, and adjusting the temperature of the melt to be between 1500 and 1600 ℃ to obtain a high-manganese high-nitrogen alloy melt;
s4, gradually adding industrial pure iron into the furnace at the adding speed of 800kg/min and controlling the melt temperature between 1500 ℃ and 1550 ℃;
and S5, after the addition is finished, keeping the melt temperature at 1520-1550 ℃, simultaneously uniformly stirring for 10min by using the medium-frequency electromagnetic action, raising the melt temperature to 1650 ℃, and performing sampling, tapping and casting after deoxidation and slag discharge to finally prepare the high-nitrogen steel.
The weight of the obtained high-nitrogen steel is weighed to be 84.2kg, and the main chemical components are detected as follows: 0.39 wt% of C, 1.272 wt% of Si, 26.79 wt% of Cr, 0.612 wt% of Mo, 1.658 wt% of Mn, 0.349 wt% of V, 0.15 wt% of N, 12.625 wt% of Ni, 0.152 wt% of Nb, 40.85.03 wt% of Fe, and the balance of other elements.
The composition of the high nitrogen steel is shown in table 1:
TABLE 1 composition of high nitrogen steel
The high-nitrogen steel is subjected to high-temperature endurance test, and the result is shown in table 2:
TABLE 2 high-temp. endurance test data table for high-nitrogen steel
The high-nitrogen steel is subjected to oxidation resistance test, and is placed for 500 hours at the high temperature of 1000 ℃, and the oxidation condition is shown in table 3:
TABLE 3 table of antioxidant property test data of high nitrogen steel
| σ1000/Mpa | Oxidation weight gain/g.cm-2 |
| 16.8 | 49.4 |
Example 6
The preparation method of the anti-deformation, high-temperature oxidation resistance and wear resistance high-nitrogen steel by taking the ferrochrome nitride and the ferrochrome as main nitrogen-added alloys comprises the following steps:
s1, the total weight of the prepared materials is 91kg, wherein the main materials of the base steel are as follows: 60.9kg of industrial pure iron, 1.09g of ferromolybdenum, 14kg of ferrochromium and 0.46kg of nickel; the preparation of the high-nitrogen alloy melt material comprises the following steps: 13.635kg of ferrochromium nitride and 0.75kg of manganese nitride; 0.073kg of rare earth materials;
s2, preparing a high-nitrogen alloy melt by using a medium-frequency induction furnace, adding high-nitrogen ferrochrome and manganese nitride into the furnace, heating until the high-nitrogen ferrochrome and the manganese nitride are completely molten, and adjusting the temperature of the melt to be 1600-1650 ℃;
s3, adding ferromolybdenum, ferrochromium, nickel and other materials into the furnace until the materials are completely melted, and adjusting the temperature of the melt to be between 1500 and 1630 ℃ to obtain a high-manganese high-nitrogen alloy melt;
s4, gradually adding industrial pure iron into the furnace at the speed of 800kg/min, and controlling the melt temperature between 1500 ℃ and 1550 ℃;
and S5, after the addition is finished, keeping the melt temperature at 1520-1550 ℃, simultaneously uniformly stirring for 10min by using the medium-frequency electromagnetic action, raising the melt temperature to 1650 ℃, and performing sampling, tapping and casting after deoxidation and slag discharge to finally prepare the high-nitrogen steel.
The weight of the obtained high-nitrogen steel is weighed to be 89.2Kg, and the main chemical components are detected as follows: 0.546% of C, 0.429% of N, 18.6% of Cr, 0.596% of Mn, 0.658% of Mo, and Ni: 0.082.
the composition of the high nitrogen steel is shown in table 4:
TABLE 4 composition table of high nitrogen steel
| C | Cr | Mn | Ni | Si | N | P、S | Mo | RE | Fe |
| 0.10-1 | 14.0-18.0 | 0.5-1.8 | 0.01-0.1 | / | 0.1-0.8 | / | 0.5-1.1 | 0.02-0.1 | Surplus |
In each of the above embodiments, a ladle pouring device is adopted during pouring, as shown in fig. 1 and 2, the device includes a ladle body 4, a travelling crane 16 for conveying the ladle body 4, a support 9 arranged in a pouring area, and a driving mechanism connected to the support 9 for driving the ladle body 4 to pour, a ladle opening 5 is arranged on one side of an upper end opening of the ladle body 4, the support 9 is a top plate which is elevated and horizontally arranged, two opposite sides of the support 9 are both connected with a side vertical plate 12 which is vertically arranged, a space for placing the ladle body 4 is reserved between the two side vertical plates 12, and a group of driving mechanisms is respectively arranged on the two side vertical plates 12;
as shown in fig. 1, the driving mechanism includes an arc-shaped inner rail 7, an arc-shaped main rail 6 and an arc-shaped outer rail 13 concentrically arranged on the side vertical plate 12, the arc-shaped inner rail 7, the arc-shaped main rail 6 and the arc-shaped outer rail 13 all use the tip of the ladle opening 5 as the center of a circle, the arc-shaped main rail 6 is located in the middle between the arc-shaped inner rail 7 and the arc-shaped outer rail 13, and the bending directions of the arc-shaped inner rail 7, the arc-shaped main rail 6 and the arc-shaped outer rail 13 are the same; the inner arc-shaped track 7 and the outer arc-shaped track 13 are respectively connected with a sliding block 15 in a sliding manner, a connecting insert block 18 for connecting the ladle body 4 is arranged in the sliding block 15 in a penetrating manner, as shown in fig. 2, two connecting blocks 20 which are respectively aligned with the bottoms of the inner arc-shaped track 7 and the outer arc-shaped track 13 are fixed on the corresponding sides of the ladle body 4, a connecting slot 19 for inserting the connecting insert block 18 is formed in one side of each connecting block 20, which is back to the ladle body 4, a driving connecting rod 3 which is positioned on the outer side of the side vertical plate 12 is connected between the two sides, which are back to the ladle body 4, of the connecting insert blocks 18, and the driving connecting rods 3 are both positioned in the radial direction of the inner arc-shaped track 7 and the outer arc-shaped track 13; a traction rope 14 extending along the radian of the arc main track 6 penetrates through the arc main track 6, as shown in fig. 3, the lower end of the traction rope 14 is connected with an inner sliding block 23 connected with the arc main track 6 in a sliding manner, the middle part of the driving connecting rod 3 is fixedly connected with the inner sliding block 23 through a connecting plate 21, a winding shaft 8 connected with the upper end of the traction rope 14 and used for winding the traction rope 14 is arranged above the upper end of the arc main track 6, one end of the winding shaft 8 is connected with a driving motor 10, and two ends of the winding shaft 8 are respectively connected with the side vertical plates 12 through bearings 11.
In order to stably realize the insertion relationship between the connection slot 19 and the connection block 18, as shown in fig. 1 and 2, the connection slot 19 has a circular cross section, and at least two rectangular groove portions (four rectangular groove portions are shown in the drawing) extending outward are provided at equal intervals on the circumferential side of the connection slot 19, and the connection block 18 is adapted to the shape of the connection slot 19. The arrangement of the rectangular groove part can stably realize the splicing relation between the connecting slot 19 and the connecting plug 18 and prevent the relative rotation between the two.
In order to ensure stable transportation of the ladle body 4, as shown in fig. 1 and 2, a carrier plate 2 for placing the ladle body 4 is arranged on the travelling crane 16, a clamping block for limiting the ladle body 4 is arranged on the carrier plate 2, the bottom of the carrier plate 2 is connected to a bottom plate of the travelling crane 16 through a longitudinally arranged electric telescopic rod 1, and a universal wheel 17 is mounted at the bottom of the bottom plate of the travelling crane 16. The carrier plate 2 with the clamping blocks can ensure that the ladle body 4 is stably conveyed, and after the ladle body 4 is connected to the driving mechanism, the carrier plate 2 can be driven to descend by driving the electric telescopic rod 1, so that the travelling crane 16 can be removed conveniently, and the ladle body 4 can be rotated in a sufficient space below the ladle body 4.
In order to prevent the sliding block 15 from being separated from the arc-shaped inner rail 7 or the arc-shaped outer rail 13, as shown in fig. 4, the section of the sliding block 15 is i-shaped, and the middle part of the sliding block is positioned in the corresponding arc-shaped inner rail 7 or the arc-shaped outer rail 13; in order to ensure the movement of the inner slide 23 within the curved main rail 6, as shown in fig. 3, the inner arc sides of the inside of the curved main rail 6 are provided with rollers 22 at equal intervals along the arc direction thereof, and the corresponding sides of the inner slide 23 are in adhesive contact with the rollers 22. The sliding block 15 is designed in an I shape, so that the sliding block can be prevented from being separated from the arc-shaped inner track 7 or the arc-shaped outer track 13; the provision of the roller 22 facilitates the sliding relationship between the slider 23 and the arc-shaped main rail 6, so that the movement of the inner slider 23 can be ensured.
In order to prevent dross in the melt from pouring into the molding apparatus, as shown in fig. 5 and 6, a longitudinally-arranged rotary baffle 25 is provided inside the ladle body 4 on the side of the ladle opening 5, the front side and the rear side of the rotating baffle 25 are completely attached to the side walls of the corresponding sides of the ladle body 4, a rotating shaft 27 fixedly connected to the inner wall of the ladle body 4 transversely penetrates through the middle part of the rotating baffle 25, the rotating baffle 25 can rotate freely around the rotating shaft 27, the upper end part of the ladle body 4 is fixed with a limiting block 26 used for limiting the rotating angle of the rotating baffle 25, the lower part of the ladle body 4 is provided with a push roller 28 which is positioned at the lower end of the rotating baffle 25 and is back to one side of the ladle opening 5, the push roller 28 is parallel to the rotating shaft 27, and the inner wall of the casting ladle body 4 corresponding to the two ends of the push roller 28 is provided with a groove-shaped guide rail 24 for the end part of the push roller 28 to insert and move transversely. In an initial state, the upper part of the rotating baffle 25 is attached to the ladle opening 5, the lower end of the rotating baffle 25 is positioned on one side of the rotating shaft 27 back to the ladle opening 5, and the push roller 28 is positioned on one side of the groove-shaped guide rail 24 back to the ladle opening 5; when the ladle body 4 starts to rotate for pouring, the push roller 28 moves towards the side of the ladle opening 5 along the groove-shaped guide rail 24, so that the lower end of the rotating baffle 25 can be pushed to move towards the side of the ladle opening 5, the upper end of the rotating baffle 25 leaves the ladle opening 5 until the limiting block 26 is touched, when pouring, melt can pass through the inner wall of the side of the rotating baffle 25 and the ladle opening 5 from the lower end side of the rotating baffle 25, finally the melt is poured out from the position between the upper end of the rotating baffle 25 and the ladle opening 5, and scum floating on the surface of the melt can be blocked by the rotating baffle 25 and cannot be discharged, so that the quality of the poured melt can be improved.
The concrete action principle of the casting ladle pouring device is as follows:
the ladle body 4 filled with the melt is pushed to a position between the two side vertical plates 12 by the travelling crane 16, the connecting block 20 is aligned with the corresponding sliding block 15 (at the moment, the two sliding blocks 15 are both positioned at the lower end of the arc-shaped inner rail 7 or the arc-shaped outer rail 13, the inner sliding block 23 is also positioned at the lower end of the arc-shaped main rail 6), then the connecting inserting block 18 is inserted into the connecting slot 19 and clamped, after the two sides of the ladle body 4 are connected with the driving mechanisms at the corresponding sides, the carrier plate 2 is driven to descend and remove the travelling crane 16 by the electric telescopic rod 1, then the two driving motors 10 are simultaneously started to drive the winding shaft 8 to rotate, the pulling rope 14 is wound, the inner sliding block 23 is pulled to move upwards along the arc-shaped main rail 6, the driving connecting rod 3 is driven to move upwards, so that the two sliding blocks 15 respectively move upwards along the arc-shaped inner rail 7 and the arc-shaped outer rail 13 to drive the ladle body 4 to rotate, the arc-shaped inner track 7, the arc-shaped main track 6 and the arc-shaped outer track 13 all use the tip of the ladle opening 5 as the center of a circle, so that the ladle body 4 rotates upwards around the tip of the ladle opening 5; the driving connecting rod 3 is connected between the two sliding blocks 15, and the driving connecting rod 3 is positioned in the radial direction of the arc-shaped inner track 7 and the arc-shaped outer track 13, so that the length of the driving connecting rod 3 is the shortest distance between the arc-shaped inner track 7 and the arc-shaped outer track 13, and the two sliding blocks 15 can be prevented from relative deviation, the pouring position of a pouring ladle is kept unchanged in the pouring process, the molten metal splashing waste caused by the change of the pouring gate position in the pouring process is reduced, the safety of casting production is improved, the utilization rate of alloy materials is improved, the energy is saved, and the personal safety of workers is improved;
in addition, in the pouring process, as shown in fig. 6, due to the rotation of the ladle body 4, the push roller 28 moves along the groove-shaped guide rail 24 to the side of the ladle opening 5, so that the lower end of the rotating baffle 25 can be pushed to move to the side of the ladle opening 5, the upper end of the rotating baffle 25 leaves the ladle opening 5 until touching the limiting block 26, when pouring, the melt can pass between the rotating baffle 25 and the inner wall of the side of the ladle opening 5 from the lower end of the rotating baffle 25, and finally can be poured out from between the upper end of the rotating baffle 25 and the ladle opening 5, and the scum floating on the surface of the melt can be blocked by the rotating baffle 25 and cannot be discharged, so that the quality of the melt for pouring can be improved.
According to the content, the preparation method provided by the invention can promote the stable fusion of the high-nitrogen alloy and the base steel material so as to obtain the high-nitrogen steel blank with less bubbles and high nitrogen content, and the high-nitrogen martensitic stainless steel can be produced due to the introduction of the carbon element, so that the finally prepared product has the characteristics of high hardness, high-temperature oxidation resistance, low temperature resistance and wear resistance; the pouring device of the pouring ladle provided by the invention can keep the pouring position of the pouring ladle unchanged, reduce the metal liquid splashing waste caused by the change of the pouring gate position in the pouring process, and improve the quality of the melt for realizing pouring.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (5)
1. The preparation method of the high-nitrogen stainless steel is characterized by comprising the following steps:
s1, the total weight of prepared materials is 91kg, wherein the base steel material is as follows: 60.9kg of industrial pure iron, 1.09g of ferromolybdenum, 14kg of ferrochromium and 0.46kg of nickel; the materials for preparing the high-nitrogen alloy melt are as follows: 13.635kg of ferrochromium nitride and 0.75kg of manganese nitride; 0.073kg of rare earth materials;
s2, preparing a high-nitrogen alloy melt by using a medium-frequency induction furnace, adding high-nitrogen ferrochrome and manganese nitride into the furnace, heating until the high-nitrogen ferrochrome and the manganese nitride are completely molten, and adjusting the temperature of the melt to be 1600-1650 ℃;
s3, adding ferromolybdenum, ferrochromium, nickel and other materials into the furnace until the materials are completely melted, and adjusting the temperature of the melt to be between 1500 and 1630 ℃ to obtain a high-manganese high-nitrogen alloy melt;
s4, gradually adding industrial pure iron into the furnace at the adding speed of 800kg/min and controlling the melt temperature between 1500 ℃ and 1550 ℃;
s5, after the addition is finished, keeping the melt temperature at 1520-1550 ℃, simultaneously uniformly stirring for 10min by using the medium-frequency electromagnetic action, raising the melt temperature to 1650 ℃, carrying out sampling and tapping pouring after deoxidation and slag discharge, and finally preparing the high-nitrogen steel by adopting a ladle pouring device;
the pouring ladle pouring device comprises a pouring ladle body (4), a travelling crane (16) used for conveying the pouring ladle body (4), a support (9) arranged in a pouring area and a driving mechanism connected to the support (9) and used for driving the pouring ladle body (4) to pour, wherein a pouring ladle port (5) is arranged on one side of an upper port of the pouring ladle body (4), the support (9) is a top plate which is elevated and horizontally arranged, two opposite sides of the support (9) are both connected with a vertically arranged side vertical plate (12), a space for placing the pouring ladle body (4) is reserved between the two side vertical plates (12), and a group of driving mechanisms is respectively arranged on the two side vertical plates (12);
the driving mechanism comprises an arc-shaped inner rail (7), an arc-shaped main rail (6) and an arc-shaped outer rail (13) which are concentrically arranged on the side vertical plate (12), the arc-shaped inner rail (7), the arc-shaped main rail (6) and the arc-shaped outer rail (13) all use the tip end of the ladle opening (5) as the center of a circle, the arc-shaped main rail (6) is positioned in the middle between the arc-shaped inner rail (7) and the arc-shaped outer rail (13), and the bending directions of the arc-shaped inner rail (7), the arc-shaped main rail (6) and the arc-shaped outer rail (13) are the same; the inner arc-shaped rail (7) and the outer arc-shaped rail (13) are respectively connected with a sliding block (15) in a sliding mode, connecting inserting blocks (18) used for connecting the ladle body (4) penetrate through the sliding blocks (15), two connecting blocks (20) which are respectively aligned to the bottoms of the inner arc-shaped rail (7) and the outer arc-shaped rail (13) are fixed on the corresponding sides of the ladle body (4), connecting slots (19) for inserting the connecting inserting blocks (18) are formed in one sides, back to the ladle body (4), of the connecting blocks (20), and a driving connecting rod (3) located on the outer side of the side vertical plate (12) is connected between the sides, back to the ladle body (4), of the two connecting inserting blocks (18); a traction rope (14) extending along the radian of the arc-shaped main track (6) penetrates through the arc-shaped main track (6), the lower end of the traction rope (14) is connected with an inner sliding block (23) in sliding connection with the arc-shaped main track (6), the middle part of the driving connecting rod (3) is fixedly connected with the inner sliding block (23) through a connecting plate (21), a winding shaft (8) which is connected with the upper end of the traction rope (14) and used for winding the traction rope (14) is arranged above the upper end of the arc-shaped main track (6), one end of the winding shaft (8) is connected with a driving motor (10), and the two ends of the winding shaft (8) are respectively connected with the side vertical plates (12) through bearings (11);
the ladle body (4) is internally provided with a rotating baffle (25) which is longitudinally arranged at the side of the ladle opening (5), the middle part of the rotating baffle (25) transversely penetrates through a rotating shaft (27) fixedly connected to the inner wall of the ladle body (4), the rotating baffle (25) can freely rotate around the rotating shaft (27), the upper end part of the ladle body (4) is fixedly provided with a limiting block (26) for limiting the rotating angle of the rotating baffle (25), the lower part of the ladle body (4) is provided with a push roller (28) which is positioned at the lower end of the rotating baffle (25) and faces away from one side of the ladle opening (5), the push roller (28) is parallel to the rotating shaft (27), and a groove-shaped guide rail (24) which is used for inserting the end part of the push roller (28) and transversely moving is arranged on the inner wall of the side of the ladle body (4) corresponding to the two ends of the push roller (28).
2. The method of claim 1, wherein in step S4, the shape of the industrial pure iron is granular or bar-shaped, and the granular size is phi 1-phi 30 mm; the size of the strip-shaped cross section is phi 1-phi 30 mm.
3. The method for preparing a high-nitrogen stainless steel according to claim 1, wherein the cross section of the connecting slot (19) is circular, and the periphery of the connecting slot is provided with at least two rectangular slot parts extending outwards at equal intervals, and the connecting plug (18) is matched with the shape of the connecting slot (19).
4. The method for preparing the high-nitrogen stainless steel according to claim 1, wherein a carrier plate (2) for placing the ladle body (4) is arranged on the travelling crane (16), a clamping block for limiting the ladle body (4) is arranged on the carrier plate (2), the bottom of the carrier plate (2) is connected to a bottom plate of the travelling crane (16) through a longitudinally arranged electric telescopic rod (1), and universal wheels (17) are mounted at the bottom of the bottom plate of the travelling crane (16).
5. The method for preparing a high-nitrogen stainless steel according to claim 1, wherein the slide block (15) has an i-shaped cross section, the middle part of the slide block is positioned in the corresponding arc-shaped inner rail (7) or the corresponding arc-shaped outer rail (13), the inner arc side of the inner part of the arc-shaped main rail (6) is provided with rollers (22) at equal intervals along the radian direction of the inner arc side, and the corresponding side of the inner slide block (23) is in attached contact with the rollers (22).
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